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Catapult fires an 800-kg rock with an initial velocity of 100 m/sat a 40° angle from ground. What is the magnitude of the horizontal impulse the catapult receives from the rock?
A clamped mechanical device (such as a metal ruler) oscillates in vacuum at a frequency (assume there is no damping in this case) of 10.0 Hz. Find the characteristic decay time for the damped motion
An automotive junkyard crushes old vehicles into cubes0.34 m on a side. Assume that these cubes are made of iron. Find the resistance you would expect to encounter if you connected one wire to the center of a face and one wire to the center of the..
A 120 kg barrel which is initially at rest is rolled down an inclined plane. The friction between the barrel and the surface of the plane is negligible, calculate the barrel's velocity when it reaches the ground level
After watching a news story about a fire in a high rise apartment building, you and friend decide to design an emergency escape device from the top of a building. To avoid engine failure, your friend suggest a gravitational powered elevator. calcu..
The label on a 12.0-V truck battery states that it is rated at 150.0 A·h (ampere-hours). Treat the battery as ideal. How much electric energy can the battery supply
A 60 kg crate is lowered using arope over a fixed support. The rope exerts a constant upward forceof 500 N.? How fast is the crate traveling when it hits the floor
A ball of mass 5.8 kg and radius 13 cm rolls without slipping horizontally at 5.6 m/s and hits a spring attached to a wall. What is the maximum change in length of the spring
A rectangular loop of wire of dimensions 12 cm × 25 cm faces a long straight wire. The two long sides of the loop are parallel to the wire, What translational force does the straight wire exert on the loop
A 755-loop square armature coil with a side of 8.5 cm rotates at 65.0 rev/s in a uniform magnetic field of strength 0.75 T. What is the rms voltage output of the generator
A sample of wood from an archaeological excavation is dated by using a mass spectrometer to measure the fraction of 14C atoms. What is the wood's age
A parallel-plate capacitor has plates of area 114.0 cm2 and a separation of 1.45 cm. A battery charges the plates to a potential difference of 177.0 V, What is the capacitance with the slab in place
A refrigerator has a coefficient of performance of 2.15. Each cycle it absorbs 3.30×104 of heat from the cold reservoir. how much heat is discarded to the high-temperature reservoir
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